Burning aching gums

I am a extremely healthy 67 year old female i have excellent dental history but for the last 11 months my gums have been aching. I have been to Dentist, Oral specialist , ENT, Internist and have had total blood work, CT scanEverything is normal! am trying to figure out what could be causing this to happen .
any help would be appreciated

Hi there, I have recently started to get this not so much burning but aching mostly on the bottom row, Ive no idea why.